CN117567175A - A high water-retaining organic silicone concrete external curing agent and its preparation method - Google Patents

Abstract

An external curing agent of high-water-retention organosilicon concrete and a preparation method thereof are provided, wherein the external curing agent is prepared from the following raw materials: methyltrimethoxysilane, dimethyldimethoxysilane, gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, tetrabutyl titanate, a solvent, deionized water and a hydrolysis catalyst. The preparation method comprises the following steps: adding methyltrimethoxysilane, dimethyldimethoxysilane, gamma- (2, 3-glycidoxy) propyltrimethoxysilane, a hydrolysis catalyst and deionized water into a reaction kettle, and starting stirring to perform hydrolysis reaction to obtain a hydrolysis product; adding solvent into the reaction kettle for dilution, stirring, adding tetrabutyl titanate, and stirring. The external curing agent can ensure that concrete is fully hydrated under the condition of primary spraying or brushing in the early stage, has the waterproof and impervious effects in the later stage, can effectively permeate the surface of the concrete and solidify to block capillary holes of the filled concrete, and has the advantages of strong adhesive force, good weather resistance, no toxicity, no harm and environmental friendliness.

Description

A high water-retaining organic silicone concrete external curing agent and its preparation method

Technical field

The invention relates to a concrete external curing agent, specifically a high water retention type organic silicone concrete external curing agent, and belongs to the technical field of chemical additives for building materials. The present invention also relates to a preparation method of the concrete external curing agent, specifically a preparation method of a high water retention type organic silicone concrete external curing agent.

Background technique

Construction safety has always been a focus of social attention. With the rapid development of domestic real estate and engineering project construction processes, people's requirements for the safety and reliability of buildings have gradually increased. Since the advent of cement concrete, it has been the most important structural material in construction projects. Properties such as strength and durability of concrete directly affect the quality of the building. During the hydration and hardening process of concrete, volume shrinkage and deformation will occur. At the same time, it will also cause the internal tensile stress of the concrete to be greater than the tensile strength, resulting in cracking and water seepage, which seriously affects the durability of concrete, the stability of steel bars, and the safety of the building. In order to prevent the occurrence of concrete cracking and water seepage, waterproofing agents and silane impregnating agents play a very obvious role. Waterproofing agents contain colloids or other components that block and fill capillary pores. After the cement concrete hardens, they remain in the capillary pores. Cut off capillary pores to achieve waterproofing; the small molecular structure of silane impregnating agent can penetrate the cementitious surface, penetrate into the concrete, and react chemically with air exposed to acidic or alkaline environments and water molecules in the substrate. Forms a water-repellent treatment layer to inhibit moisture from entering the substrate. In addition, for fresh concrete, adequate curing is a decisive factor in ensuring concrete strength and good impermeability. Concrete curing is conducive to the sufficient hydration of cement to reduce the porosity of concrete and cut off the continuity of capillary pores. Practice has proved , concrete curing for 14 days can greatly improve its impermeability. Before the final setting of fresh concrete, its internal moisture content is even more important to ensure that the cement is fully hydrated. Therefore, timely application of curing agent during the final setting stage of concrete can prevent the loss of internal moisture and effectively ensure its The degree of hydration ensures its strength. Therefore, an external concrete curing agent that can penetrate into the capillary pores of the concrete surface and form a hydrophobic film layer on the concrete surface can achieve the two major purposes of concrete curing and waterproofing and impermeability at the same time, and can more effectively prevent and control shrinkage and cracking of concrete. A series of building safety hazards.

Relevant patent documents: CN111138209A discloses a concrete external curing agent. The raw materials of the concrete external curing agent include modified polyolefin wax emulsion, organic emulsion, silane coupling agent, reinforcing agent and inorganic densifying component. The prepared concrete external curing agent uses modified polyolefin wax emulsion as the main raw material and contains some reinforcing agents. It not only retains water through the film-forming effect of the wax emulsion and organic emulsion, but also adds reinforcing agents as catalysts to accelerate the curing of concrete. The hydration of tricalcium aluminate content and the formation of ettringite play a certain enhancing role. CN105294161A discloses an unsaturated siloxane phosphate emulsion concrete curing agent and a preparation method thereof. The curing agent includes the following mass percentage of raw materials: 10% to 55% of unsaturated siloxane phosphate, 0% to 30% unsaturated acid, 5% to 40% unsaturated acid ester, 5% to 10% emulsifier, 0.1% to 0.5% catalyst, 0.1% to 0.5% initiator, 1% to 3% Film-forming aid, 0.1% to 0.5% thickener, 1% to 3% leveling agent, 0.01% to 0.3% defoaming agent and the remainder water; the preparation method includes: at 60°C to 90°C Under the temperature condition of Film-forming aids, thickeners, leveling agents and defoaming agents are added to the emulsion to prepare the finished curing agent.

The above technologies are very useful for how to make the concrete external curing agent spray or brush once in the early stage to ensure that the concrete is fully hydrated and play a waterproof and impermeable role in the later stage. It can effectively penetrate into the concrete surface and solidify to block the capillary filling of the concrete. Kong did not give specific guidance.

Contents of the invention

The technical problem to be solved by the present invention is to provide a high water-retaining silicone concrete external curing agent, which can ensure that the concrete is fully hydrated with one spray or brushing in the early stage and has a waterproof and anti-seepage effect in the later stage. , the external curing agent has good permeability, can effectively penetrate into the concrete surface and solidify to plug and fill the concrete capillary pores, and has strong adhesion, good weather resistance, non-toxic, harmless, and environmentally friendly.

For this reason, another technical problem to be solved by the present invention is to provide a method for preparing the above-mentioned high water retention type organic silicone concrete external curing agent.

In order to solve the above technical problems, the technical solutions adopted by the present invention are as follows:

The technical solution of a high water-retaining silicone concrete external curing agent is that it is made of the following components and raw materials in parts by mass: 50-150 parts of methyltrimethoxysilane, 30-80 parts of dimethyl Dimethoxysilane, 15-60 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, that is, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 5-10 parts of tetrabutyl titanate, 30-100 parts of solvent, 20-50 parts of deionized water, 1-5 parts of hydrolysis catalyst; the solvent is one of methanol, ethanol, diacetone alcohol, acetone or Several combinations, the proportions are arbitrary when combined; the hydrolysis catalyst is one or a combination of two of acetic acid (that is, glacial acetic acid) and oxalic acid, the proportions are arbitrary when combined, and the hydrolysis catalyst has It has the dual effect of promoting hydrolysis of silane coupling agent and improving the stability of silanol.

The preparation method of the high water-retaining silicone concrete external curing agent includes the following process steps: ① According to the above mass ratio, combine methyltrimethoxysilane, dimethyldimethoxysilane, γ-(2,3 -Glycidoxypropyltrimethoxysilane, hydrolysis catalyst and deionized water are put into the reaction kettle, mechanical stirring is started, the rotation speed is 100~200r/min, and the hydrolysis reaction is carried out at normal temperature (25℃) for 2-4 hours. Obtain a hydrolyzate; ② Then, add a solvent to the reaction kettle for dilution, stir for 5 to 10 minutes, then add tetrabutyl titanate, and stir for 1 to 3 hours. The product obtained is a colorless and transparent solution, which is the high Water-retaining silicone concrete exterior curing agent.

The method of using the high water-retaining organic silicone concrete external curing agent is to spray or brush the high water-retaining organic silicone concrete external curing agent on the concrete surface, and the dosage (painting amount) can be 200-220g/m ^2. Curing at room temperature (25°C) for 1 to 3 hours to form a transparent, smooth and hydrophobic film layer.

Among the above technical solutions, the preferred technical solution may be: the high water retention type silicone concrete external curing agent is made of the following components and raw materials in parts by mass: 100 parts of methyltrimethoxysilane, 50 parts parts of dimethyldimethoxysilane, 50 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 10 parts of tetrabutyl titanate, 50 parts of solvent, that is, 40 parts of methanol and 10 parts of dimethyl A combination of acetol, 25 parts of deionized water, and 3 parts of hydrolysis catalyst, namely acetic acid; the preparation method of the high water-retaining silicone concrete external curing agent includes the following process steps: ① According to the above mass ratio, methyl trimethoxy silane, dimethyldimethoxysilane, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, hydrolysis catalyst and deionized water were put into the reaction kettle, and mechanical stirring was started at a speed of 150r/ min, perform a hydrolysis reaction at room temperature for 2 hours to obtain a hydrolyzate; ② Then, add solvents, namely methanol and diacetone alcohol, to the reaction kettle for dilution, stir for 5 minutes, then add tetrabutyl titanate, and stir for 1 hour to obtain The product is a colorless and transparent solution, which is the high water retention type silicone concrete external curing agent.

Among the above technical solutions, preferred technical solutions may also be Embodiment 2, Embodiment 3, and Embodiment 4.

The invention provides a high water-retaining silicone concrete external curing agent and a preparation method thereof. The external curing agent is made of the following raw materials: methyltrimethoxysilane, dimethyldimethoxysilane, γ-(2,3-glycidoxy)propyltrimethoxysilane, tetrabutyl titanate, solvent, deionized water, hydrolysis catalyst. Preparation method: Put methyltrimethoxysilane, dimethyldimethoxysilane, γ-(2,3-epoxypropoxy)propyltrimethoxysilane, hydrolysis catalyst and deionized water into the reaction kettle, Turn on the stirring, carry out the hydrolysis reaction, and obtain the hydrolyzate; then add a solvent to the reaction kettle to dilute, stir, and then add tetrabutyl titanate and stir. Through comparative tests, the present invention can ensure that the concrete is fully hydrated with one spraying or brushing in the early stage and plays a waterproof and impermeable role in the later stage. The external curing agent has good permeability and can effectively penetrate into the concrete surface and solidify to It blocks and fills concrete pores, has strong adhesion, good weather resistance, is non-toxic, harmless and environmentally friendly. For its performance, please refer to Table 1, Table 2 and Table 3 in this application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments in the invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the invention.

Example 1: The high water-retaining silicone concrete external curing agent of the present invention is made of the following components and mass parts of raw materials: 100 parts of methyltrimethoxysilane, 50 parts of dimethyldimethyl Oxysilane, 50 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 10 parts of tetrabutyl titanate, 50 parts of solvent, a combination of 40 parts of methanol and 10 parts of diacetone alcohol, 25 parts of deionized water, and 3 parts of hydrolysis catalyst, that is, acetic acid; the preparation method of the high water-retaining silicone concrete external curing agent includes the following process steps: ① According to the above mass ratio, combine methyltrimethoxysilane, dimethyl Dimethoxysilane, γ-(2,3-glycidoxy)propyltrimethoxysilane, hydrolysis catalyst and deionized water were put into the reaction kettle, mechanical stirring was started, the rotation speed was 150r/min, and hydrolysis was carried out at room temperature. React for 2 hours to obtain the hydrolyzate; ② Then, add solvents, namely methanol and diacetone alcohol, to the reaction kettle for dilution, stir for 5 minutes, then add tetrabutyl titanate, and stir for 1 hour to obtain a colorless transparent solution. , which is the high water retention type silicone concrete external curing agent.

Embodiment 2: The high water-retaining silicone concrete external curing agent of the present invention is made of the following components and mass parts of raw materials: 75 parts of methyltrimethoxysilane, 75 parts of dimethyldimethyl Oxysilane, 25 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 5 parts of tetrabutyl titanate, 50 parts of solvent, a combination of 35 parts of ethanol and 15 parts of diacetone alcohol, 25 2 parts of deionized water, 2 parts of hydrolysis catalyst, that is, oxalic acid; the preparation method of the high water retention type silicone concrete external curing agent includes the following process steps: ① According to the above mass ratio, combine methyltrimethoxysilane, dimethyl Dimethoxysilane, γ-(2,3-glycidoxy)propyltrimethoxysilane, hydrolysis catalyst and deionized water were put into the reaction kettle, mechanical stirring was started, the rotation speed was 200r/min, and hydrolysis was carried out at room temperature. React for 3 hours to obtain the hydrolyzate; ② Then, add solvents, namely ethanol and diacetone alcohol, to the reaction kettle for dilution, stir for 10 minutes, then add tetrabutyl titanate, and stir for 2 hours to obtain a colorless transparent solution. , which is the high water retention type silicone concrete external curing agent.

Embodiment 3: The high water-retaining silicone concrete external curing agent of the present invention is made of the following components and mass parts of raw materials: 100 parts of methyltrimethoxysilane, 50 parts of dimethyldimethyl Oxysilane, 25 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 8 parts of tetrabutyl titanate, 70 parts of solvent, a combination of 55 parts of methanol and 15 parts of diacetone alcohol, 25 parts of deionized water, 2.5 parts of hydrolysis catalyst, which is a combination of 1.5 parts of acetic acid and 1 part of oxalic acid. The preparation method of the high water-retaining silicone concrete external curing agent includes the following process steps: ① According to the above mass ratio, combine methyltrimethoxysilane, dimethyldimethoxysilane, γ-(2,3 - Glycidoxy)propyltrimethoxysilane, acetic acid, oxalic acid and deionized water were put into the reaction kettle, mechanical stirring was started, the rotation speed was 180r/min, and the hydrolysis reaction was carried out at room temperature for 4 hours to obtain the hydrolyzate; ② Then, Then add solvents, namely methanol and diacetone alcohol, to the reaction kettle for dilution, stir for 10 minutes, then add tetrabutyl titanate, and stir for 3 hours to obtain a colorless and transparent solution, which is the high water retention silicone concrete. External curing agent.

Embodiment 4: The high water-retaining silicone concrete external curing agent of the present invention is made of the following components and mass parts of raw materials: 100 parts of methyltrimethoxysilane, 50 parts of dimethyldimethyl Oxysilane, 25 parts of γ-(2,3-epoxypropoxy)propyltrimethoxysilane, 8 parts of tetrabutyl titanate, 50 parts of solvent, which is a combination of 35 parts of methanol and 15 parts of diacetone alcohol, 25 3 parts of deionized water and 3 parts of hydrolysis catalyst, namely acetic acid. The preparation method of the high water-retaining silicone concrete external curing agent includes the following process steps: ① According to the above mass ratio, combine methyltrimethoxysilane, dimethyldimethoxysilane, γ-(2,3 - Glycidoxypropyltrimethoxysilane, hydrolysis catalyst and deionized water are put into the reaction kettle, turn on the mechanical stirring, the rotation speed is 180r/min, and carry out the hydrolysis reaction at room temperature for 3 hours to obtain the hydrolyzate; ② Then, again Add the solvents methanol and diacetone alcohol to the reaction kettle for dilution, stir for 10 minutes, then add tetrabutyl titanate, and stir for 3 hours to obtain a colorless and transparent solution, which is the high water retention silicone concrete exterior Maintenance agent.

The following is a comparative test:

Comparative Example 1: A concrete external curing agent. The preparation method of the concrete external curing agent is: Step (1): Weigh each raw material according to weight percentage; 60% polyethylene wax emulsion, 30% pure acrylic emulsion, vinyl triethylene glycol emulsion Ethoxysilane coupling agent 0.02%, triethanolamine 0.02%, sodium silicate 3%, tap water 6.96%. Step 2: Place the weighed raw materials in a forced mixer and mix them evenly to obtain the concrete external curing agent. The polyethylene wax emulsion is a polyethylene wax water emulsion with a particle size of 150 to 200 nm.

Comparative Example 2: A reinforced organic-inorganic composite concrete external curing agent prepared in Example 1 of the reinforced organic-inorganic composite concrete external curing agent and its preparation method disclosed in CN112624656A.

Comparative Example 3 (waterproof product Z-6341): silane impregnating agent. Composition: Alkylalkoxysilane (any one of methyltriethoxysilane, propyltriethoxysilane, octyltriethoxysilane and dodecyltriethoxysilane, choose methyl Triethoxysilane) and alkylsilanol (trimethylsilanol), ethanol, water. Comparative Example 3 is a commercially available product.

Comparative Example 4 (waterproof product YF-203): waterproofing agent. Composition: Alkane solvent (n-hexane, cyclohexane, n-hexane is selected), amino silicone oil, organotin catalyst (one or a combination of dibutyltin dilaurate, stannous octoate, dibutyltin diacetate, When combined, the proportion is arbitrary. Use dibutyltin dilaurate) and m-xylylene isocyanate. Comparative Example 4 is a commercially available product.

The concrete external curing agent prepared in the embodiment of the present invention and the concrete external curing agent of the comparative example were tested, and the prepared concrete curing agent was tested with reference to China's transportation industry standard JT/T522-2004 "Concrete Curing Agent for Highway Engineering" During the performance test, the slump of the concrete mixture was required to be 40mm±10mm according to the specification. The concrete mix ratio is shown in Table 1. The amount of concrete surface curing agent (of the present invention) applied was 200g/m ² . The water absorption rate of the present invention refers to the British standard "BS1881-122:2011 Testing concrete". The specific operation is: place three six-sided silicone concrete external curing agent test specimens (100mm×100mm) in an oven at 105°C ± 5°C. After drying for 72h±2, place it in a desiccator to cool for 24h±0.5h. Immediately after cooling, weigh and record the mass of each sample. Completely immerse each sample in the water tank of the concrete curing box, with the water level higher than the test piece. The highest point is 25mm±5mm. Immerse the specimen in water, remove the specimen from the water when the soaking time is 30 mins and 48 h, wipe the surface of the specimen until no residual free water is observed on the surface, weigh each specimen and record its mass. Water absorption rate calculation formula: water absorption rate (%) = (mass of the specimen after immersion (g) - mass of the specimen before immersion (g))/mass of the specimen before immersion (g).

Table 1 Concrete mix proportions for external curing agent testing

volume cement fly ash sand stone water Admixture 1m ³ 270 70 907 983 155 1.0%-1.7%

The dosage unit of materials (raw materials) used in each cubic meter of concrete in Table 1 is Kg. The dosage of admixture per cubic meter of concrete is 0.015Kg, which is 15g. The mass ratio of admixtures in Table 1 is: 1000g of admixture contains a mixed solution of 255g polycarboxylic acid high-performance water-reducing agent, 80g sustained-release water-reducing agent, 1g air-entraining agent, 5g water-retaining agent, and 659g water (mixed solution The above can be blended and stirred evenly). The above-mentioned polycarboxylic acid high-performance water-reducing agent adopts the polycarboxylic acid water-reducing agent for small-slump concrete disclosed in CN107474196A and the polycarboxylic acid water-reducing agent for small-slump concrete prepared in Example 1 of its preparation method. . The above-mentioned sustained-release water-reducing agent adopts the sustained-release high-efficiency polycarboxylate water-reducing agent disclosed in CN104016615A and the sustained-release high-efficiency polycarboxylate water-reducing agent prepared in Example 1 of its preparation method. The above-mentioned air-entraining agent adopts a water-soluble high-efficiency concrete rosin air-entraining agent disclosed in CN106082764A and the water-soluble high-efficiency concrete rosin air-entraining agent prepared in Example 1 of its preparation method. The above-mentioned water-retaining agent adopts the long-lasting concrete water-retaining agent prepared in Example 1 of the long-lasting concrete water-retaining agent and its preparation method disclosed in CN107383274A.

Table 2 Performance indicators of external curing agents

Table 3 Waterproof performance water absorption test

0.5h water absorption rate (%) 48h water absorption rate (%) benchmark specimen 2% 4.8% Example 1 0.15% 0.3% Example 2 0.2% 0.4% Example 3 0.2% 0.35% Example 4 0.18% 0.4% Comparative example 3 0.15% 0.2% Comparative example 4 0.45% 2.58%

It can be seen from the test data that the effective water retention rate and 28d compressive strength ratio of the present invention (Example 1 to Example 4) are significantly better than those of Comparative Examples 1 and 2. In addition, the 0.5h water absorption rate of the present invention can reach the waterproof product of Comparative Example 3, and the 48h water absorption rate also reaches a high level (good performance), so it can effectively prevent various diseases caused by water seepage in the base material and improve the use of the building. life.

To sum up, the present invention provides a high water-retaining silicone concrete external curing agent, which can ensure that the concrete is fully hydrated with one spraying or brushing in the early stage and has a waterproof and impermeable effect in the later stage. The external curing agent has good permeability and can effectively penetrate into the concrete surface and solidify to plug and fill the concrete capillary pores. It has strong adhesion, good weather resistance, non-toxic, harmless, and environmentally friendly.

Claims (6)

1. The high water-retention type organosilicon concrete external curing agent is characterized by being prepared from the following raw materials in parts by weight: 50-150 parts of methyltrimethoxysilane, 30-80 parts of dimethyldimethoxysilane, 15-60 parts of gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, 5-10 parts of tetrabutyl titanate, 30-100 parts of solvent, 20-50 parts of deionized water and 1-5 parts of hydrolysis catalyst; the solvent is one or the combination of a plurality of methanol, ethanol, diacetone alcohol and acetone, and the proportion is arbitrary during the combination; the hydrolysis catalyst is one or the combination of two of acetic acid and oxalic acid, and the proportion is arbitrary during the combination.

2. The high water retention type organosilicon concrete external curing agent according to claim 1, which is characterized by being prepared from the following raw materials in parts by weight: 100 parts of methyltrimethoxysilane, 50 parts of dimethyldimethoxysilane, 50 parts of gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, 10 parts of tetrabutyl titanate, 50 parts of a solvent which is a combination of 40 parts of methanol and 10 parts of diacetone alcohol, 25 parts of deionized water and 3 parts of a hydrolysis catalyst which is acetic acid.

3. The high water retention type organosilicon concrete external curing agent according to claim 1, which is characterized by being prepared from the following raw materials in parts by weight: 75 parts of methyltrimethoxysilane, 75 parts of dimethyldimethoxysilane, 25 parts of gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane, 5 parts of tetrabutyl titanate, 50 parts of a solvent which is a combination of 35 parts of ethanol and 15 parts of diacetone alcohol, 25 parts of deionized water and 2 parts of a hydrolysis catalyst which is oxalic acid.

4. The preparation method of the high water retention type organosilicon concrete external curing agent according to claim 1, which is characterized by comprising the following process steps: (1) according to the mass ratio, methyl trimethoxy silane, dimethyl dimethoxy silane, gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, a hydrolysis catalyst and deionized water are put into a reaction kettle, mechanical stirring is started, the rotating speed is 100-200 r/min, and hydrolysis reaction is carried out for 2-4 hours at normal temperature, so that a hydrolysis product is obtained; (2) then adding a solvent into a reaction kettle for dilution, stirring for 5-10 minutes, adding tetrabutyl titanate, and stirring for 1-3 hours to obtain a colorless transparent solution, namely the high-water-retention organosilicon concrete external curing agent.

5. The preparation method of the high-water-retention type organosilicon concrete external curing agent according to claim 4, which is characterized in that the high-water-retention type organosilicon concrete external curing agent is prepared from the following raw materials in parts by weight: 100 parts of methyltrimethoxysilane, 50 parts of dimethyldimethoxysilane, 25 parts of gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, 8 parts of tetrabutyl titanate, 70 parts of a solvent which is a combination of 55 parts of methanol and 15 parts of diacetone alcohol, 25 parts of deionized water, and 2.5 parts of a hydrolysis catalyst which is a combination of 1.5 parts of acetic acid and 1 part of oxalic acid;

the preparation method of the high water retention type organosilicon concrete external curing agent comprises the following process steps: (1) according to the mass ratio, methyl trimethoxy silane, dimethyl dimethoxy silane, gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, acetic acid, oxalic acid and deionized water are put into a reaction kettle, and the hydrolysis reaction is carried out for 4 hours at normal temperature under the condition that the mechanical stirring is started and the rotating speed is 180r/min, so that a hydrolysate is obtained; (2) then adding a solvent, namely methanol and diacetone alcohol, into a reaction kettle for dilution, stirring for 10 minutes, adding tetrabutyl titanate, and stirring for 3 hours to obtain a colorless transparent solution, namely the high-water-retention organosilicon concrete external curing agent.

6. The preparation method of the high-water-retention type organosilicon concrete external curing agent according to claim 4, which is characterized in that the high-water-retention type organosilicon concrete external curing agent is prepared from the following raw materials in parts by weight: 100 parts of methyltrimethoxysilane, 50 parts of dimethyldimethoxysilane, 25 parts of gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane, 8 parts of tetrabutyl titanate, 50 parts of a solvent which is a combination of 35 parts of methanol and 15 parts of diacetone alcohol, 25 parts of deionized water and 3 parts of a hydrolysis catalyst which is acetic acid;

the preparation method of the high water retention type organosilicon concrete external curing agent comprises the following process steps: (1) according to the mass ratio, methyl trimethoxy silane, dimethyl dimethoxy silane, gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, a hydrolysis catalyst and deionized water are put into a reaction kettle, mechanical stirring is started, the rotating speed is 180r/min, and hydrolysis reaction is carried out for 3 hours at normal temperature, so that a hydrolysis product is obtained; (2) then adding a solvent, namely methanol and diacetone alcohol, into a reaction kettle for dilution, stirring for 10 minutes, adding tetrabutyl titanate, and stirring for 3 hours to obtain a colorless transparent solution, namely the high-water-retention organosilicon concrete external curing agent.